DAYLIGHT GLASS 



[Cn. II 



and now colored glass is made which gives to artificial light true 

 daylight qualities. As each artificial light has its own special curve 



12 Viol* Blu 



10 



I 



/ 



~\ r 



Grw 



7 



~~1 1 T 



How Or.ng. 



17 CD 



.41 .43 .45 .47 .49 .51 .53 .55 .57 .59 .61 .63 .65 .67 .69 

 Wave Length in Microns M 



FIG. 36. CURVE OF ENERGY DISTRIBUTION IN MAZDA C LAMP, THE SUN AND 

 THE LAMPLIGHT FILTERED THROUGH DAYLIGHT GLASS (172 CD). 



(From the Sibley Journal and the Anatomical Record). 



of intensity for the different parts of the spectrum, naturally a special 

 light filter must be worked out for each light source. Up to the 

 present, glass filters have been produced for the welsbach gas light, 



